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OPx-4 gives you deep, compelling FM synthesis that is easy to dial in

  • Four operator FM synth engine with wave looping, sample offset, and multiple filters
  • Make deep, evolving sounds with a strong attack, morphing, or filter movement
  • Create digital tones like classic EPs, 80s FM synth sounds, or strange FM sound effects
  • Built-in effects with compression, EQ, delay, reverb, lo-fi effects, and more
  • Eight assignable macro knobs for easy-to-control FM synth effects
  • A 32-slot FM modulation matrix for the ultimate in sound design potential
  • Multiple preset banks give you easy access to great FM sounds
  • Purchase unlocks plug-in on three devices including PC, MAC (VST, AU, AAX) and Standalone (MPC & FORCE)

Hello Operator, Get me OPx-4!

OPx-4 is a groundbreaking four operator FM synthesizer with advanced sound editing and an easy-to-understand control layout. In addition, the system has one of the most profound FM engines ever built with a 4x4 FM matrix that includes tone shaping and filtering and a 32-slot matrix for modulating your FM tones.

HEAR THE SOUNDS OF THE OPX-4

Features expansive presets crafted by the AIR engineering team. Listen to a preview to hear samples from this amazing instrument.

Listen to audio sample

A Groundbreaking FM Synth Engine

With its flexible wave shaping, dual-mode filter path with 23 different filter types, six envelopes with tempo-synced looping, two LFOs, and two ramps, the OPx-4 will become your go-to FM synth. It includes three insert FX and two global FX for use with 27 included AIR effect plugins, such as reverb, delay, distortion, modulation effects, and more.

Leave Your Sound Design Ph.D. at the Door. OPx-4 Makes FM Synthesis Easy.

FM synthesis works by taking classic oscillator waveforms and modulating them until they sound like something brand new. If you’ve ever experimented with FM synthesis, you know it can be complicated to understand how to make great sounds. OPx-4’s simple layout and easy controls make it a breeze to experiment with FM functions without needing a deep understanding of how it works behind the scenes. An easy-to-understand control scheme makes experimenting as easy as turning knobs until it sounds great!

Four Operators, Two Filters, Thirty-Two Mod Sources, ONE Great Sound

Using four FM operators and an FM operator matrix, you can craft almost any FM sound you’ve ever heard—or even those you haven’t heard of yet! You can adjust the values of each operator using specific on-screen controls for pulse width, formant, FM filtering, and FM shaping, as well as specific ADSR and FM oscillator envelope controls.

Built-In Effects Engine to Stylize your sounds

OPx-4 includes multiple effects like EQ, amp sims, reverb, delay, and modulation. Create brilliant shimmers, dark haunting echoes, or spacey washed-out DX-style electric pianos with a cutting-edge effects engine built right into the instrument.

Download the Demo of OPx-4

This instrument is available in VST, AU, and AAX format as well as offering full support for MPC standalone and desktop systems running version 2.11 (or later). FORCE users will need version 3.2 or later. Click below to download and install the 10 day trial of the OPx-4 desktop VST, AU, or AAX version of this plugin.

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OPx-4 Documents


OPx-4 System Requirements

OPx-4 is designed to support VST 2 and VST3 Plugin hosts as well as full support for AU, AAX, and MPC/FORCE Standalone systems. This software requires an internet connection. You will need to install Akai’s MPC desktop software version 2.11 or higher to use desktop versions of the plugins.

WindowsMacMPC/FORCE Standalone Compatibility
Windows 10 (21H2) - Windows 11 (21H2)macOS 10.15.7 Catalina - macOS 12.4 Monterey (M1 compatible - check Specific MPC Models for Driver Support)OPx-4 is designed to run on standalone MPC systems running 2.11 or later, and FORCE systems running 3.2 or later, including:
2GB free disk space (20GB for all content recommended)2GB free disk space (20GB for all content)MPC One
4GB RAM (8GB recommended)4GB RAM (8GB recommended)MPC Live
Dual-core 2.5GHz CPUDual-core 2.5GHz CPUMPC Live II
VST 2/3 compatible hostVST 2/3 Plugin compatible hostMPC X
AAX plugin compatible hostAAX plugin compatible hostMPC Key 61
AU plugin compatible hostFORCE